/*
 * @(#)StreamRedirectThread.java	1.4 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright (c) 1997-2001 by Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

package daikon.chicory;

import java.io.*;

/**
 * StreamRedirectThread is a thread which copies it's input to
 * it's output and terminates when it completes.
 *
 * @version     @(#) StreamRedirectThread.java 1.4 03/01/23 16:33:15
 * @author Robert Field
 */
public class StreamRedirectThread extends Thread
{

    private final Reader in;
    private final Writer out;
    private final PrintStream outWriter;

    private static final int BUFFER_SIZE = 2048;
    //private static final int BUFFER_SIZE = 1;

    private boolean line_by_line = false;

    /**
     * Set up for copy.
     * @param name  Name of the thread
     * @param in    Stream to copy from
     * @param out   Stream to copy to
     */
    public StreamRedirectThread(String name, InputStream in, OutputStream out)
    {
        super(name);
        this.in = new InputStreamReader(in);
        this.out = new OutputStreamWriter(out);
        this.outWriter = new PrintStream(out);

        setPriority(Thread.MAX_PRIORITY - 1);
    }

    public StreamRedirectThread (String name, InputStream in, OutputStream out,
                                 boolean line_by_line) {
        this (name, in, out);
        this.line_by_line = line_by_line;
    }

    /**
     * Copy.
     */
    public void run()
    {
        try
        {
            if (line_by_line) {
                BufferedReader br = new BufferedReader(in, BUFFER_SIZE);

                char[] cbuf = new char[BUFFER_SIZE];
                int count;

                String line = null;
                while ((line = br.readLine()) != null) {
                    outWriter.println(line);
                }
            } else {
                int nextChar;
                while (true) {
                    nextChar = in.read();
                    if (nextChar == -1)
                        break;

                    out.write(nextChar);
                    out.flush();
                }

                out.flush();
            }
        }
        catch (IOException exc)
        {
            System.err.println("Child I/O Transfer - " + exc);
        }
    }
}
